When we first looked at the promises made by Thermaltake regarding the Purepower Rx 600W, we were somewhat skeptical after our past experiences with the older Purepower lineup. I will be the first to say that we were proven completely wrong since this power supply excelled in every test we could throw at it. Efficiency, voltage regulation, ripple suppression and even noise output were right in line with power supplies that cost over 25% more and Thermaltake's 5-year warranty is also top-notch.